Synergistic effect of pistachio shell powder and nano-zerovalent copper for chromium remediation from aqueous solution

The feasibility of applying nanoscale TiO2/coconut shell powder (TCNSP) composite to remove HA in aqueous solution was evaluated, and the optimization of the photocatalytic systems using newly developed TCNSP composite was performed. The developed TCNSP composite has high specific surface area (i.e., 454 m2/g) and great porosity (i.e., 66.9%) with pore size of less than 5 μm. High removal efficiencies (≥95%) of HA were observed due to the significant synergistic effects by coupling adsorption and photocatalytic reaction of TCNSP composite. As the initial concentration of HA increased, the degradation rate (Kapp) decreased due to HA sorption saturation to the surface of TCNSP composite and the photon interception by HA molecules in aqueous solution. Since the increased loading amount of TCNSP composite enhanced the number of active sites,Kappvalues increased until the optimum loading amount of TCNSP composite. As pH values increased, HA removal efficiency decreased due to increasing electrostatic repulsion between HA and TCNSP composite. Based on the response surface methodology, higher HA removal efficiencies were obtained with acidic condition, longer reaction time, and appropriated loading amount of TCNSP. Further pilot-scale study is in progress using TCNSP composite combined with UVC to remove HA from large amounts of surface water (i.e., 200 m3/d).

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Single and multielementary isotherms of toxic metals in aqueous solution using treated coconut shell powder

Desalination and Water Treatment ◽

10.5004/dwt.2011.3556 ◽

2011 ◽

pp. 289-296

Author(s):

Francisco W Sousa ◽

Andree G. Oliveira ◽

Jefferson P. Ribeiro ◽

Denis De Keukeleire ◽

Adriano F. Sousa ◽

...

Keyword(s):

Aqueous Solution ◽

Toxic Metals ◽

Coconut Shell ◽

Coconut Shell Powder ◽

Shell Powder

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EROSION WEAR AND HARDNESS SHORE D OF EPOXY RESIN FILLED WITH PISTACHIO POWDER

THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING ◽

10.32852/iqjfmme.v21i1.536 ◽

2021 ◽

Vol 21 (1) ◽

pp. 26-34

Author(s):

Hwazen Salam Fadhil ◽

Rusul Salah Hadi

Keyword(s):

Wear Rate ◽

Epoxy Resin ◽

Room Temperature ◽

Erosion Wear ◽

Weight Percentage ◽

Wear Rates ◽

Pistachio Shell ◽

Ductile Behavior ◽

Shell Powder ◽

Absorption Percentage

In this research, erosion wear rate and hardness shore D for polymer biocomposite materials were investigated. The present bio-composites made up of differing weight percentage of pistachio shell powder (0%, 5%, 7%, and 9%) with epoxy resin was prepared by hand layout method. The erosion wear rates for bio composites obtained with under constant factors (10 hours, 60º impingement angles, sand silica particles 850μm, standoff distance 23 cm, flow rate 45 L/min, room temperature, nozzle diameter 4mm and pump diameter 50 mm). Results show that the specimen (epoxy + 9% pistachio shell powder) has the best erosion wear rate resistance and hardness shore D compared with other specimens, also the specimen reinforced by 9% pistachio shell have the lower density and highest water absorption percentage and it is found that the improving percentage for the this specimen in hardness is (11.5%) and in erosion wear rate is (775%). The study reveals that the addition of pistachio shell powder to the epoxy reduces its erosion wear rate and semi ductile behavior.

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